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-rw-r--r--lib/pmfileio.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/pmfileio.c b/lib/pmfileio.c
index ab1fcd32..82b44cdb 100644
--- a/lib/pmfileio.c
+++ b/lib/pmfileio.c
@@ -10,7 +10,7 @@
        does it in other libc's).  pm_config.h defines TMPDIR as P_tmpdir
        in some environments.
     */
-#define _XOPEN_SOURCE 500    /* Make sure ftello, fseeko are defined */
+#define _XOPEN_SOURCE 600    /* Make sure ftello, fseeko are defined */
 #define _LARGEFILE_SOURCE 1  /* Make sure ftello, fseeko are defined */
 #define _LARGEFILE64_SOURCE 1 
 #define _FILE_OFFSET_BITS 64